GeezerVison

Summary

This PR replaces Kubara's internal templating, directory walking, and manual configuration validation with libkubara and introduces controller-gen for handling clean and correct CRD generation.

What changed

• Replaced custom template parsing and directory tree walking in render.go with libkubara/template and tree.
• Replaced hand-written defaults and validation in defaults.go and store.go with controller-gen/kubebuilder comments and CEL rules on PlatformSetup.
• Integarted libkubara/crdvalidate to validate configurations against the embedded CRD during creation and transitions.
• Added migration logic to upgrade older configuration files to the new PlatformSetup schema.

Why the ratio of deletions to insertions is not larger

Looking at this PR or running git diff HEAD~7 --shortstat you might notice that the ratio of insertions and deletions is nearly 1-to-1 and you might think:

I would have expected a larger difference in the insertion to deletion ratio.

While this PR deletes LARGE chunks of internal code it also introduces a lot of new logic and features. First and foremost controller-gen for automated less error prone CRD management.

Additionally this PR contains a lot of changes that aren't go code changes which offset the "real" ratio even more:

• Generated CRD yaml: The CRD manifest at src/internal/config/crd/kubara.io_platformsetups.yaml adds 244 lines of auto-generated yaml.
• Controller-gen comments: Adding controller-gen requires a lot of +kubebuilder directives and doc comments in src/internal/config/types.go to define schemas, enums, defaults, and CEL rules.
• CRD and migration code: We a new migration step in src/internal/config/migrate.go to handle older config formats.
• New tests: We added new tests in src/internal/config/crd_test.go to cover schema validation and transitions.
• Dependencies and tooling: Tooling changes added new lines between go.mod, go.sum, CI workflows, and Makefiles.

"Real" diff breakdown

Commands to verify the numbers

Diff without the generated CRD manifest:

git diff HEAD~8 --shortstat -- ':(exclude)*kubara.io_platformsetups.yaml'

Diff for Go files only:

git diff HEAD~8 --shortstat -- '*.go'

Count added Go code lines, without comments or blank lines:

git diff HEAD~8 -U0 -- '*.go' | grep -E '^\+([^+]|$)' | grep -v -E '^\+[[:space:]]*(//|/\*|\*|$)' | wc -l

Count deleted Go code lines, without comments or blank lines:

git diff HEAD~8 -U0 -- '*.go' | grep -E '^-([^-]|$)' | grep -v -E '^-[[:space:]]*(//|/\*|\*|$)' | wc -l

Diff on the exact files replaced by libkubara and controller-gen:

git diff HEAD~8 --shortstat -- \
  src/internal/render/render.go \
  src/internal/config/store.go \
  src/internal/config/store_test.go \
  src/internal/config/defaults.go \
  src/internal/config/defaults_test.go